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Chandu yadav has Published 1091 Articles

Chandu yadav
372 Views
To get the users logged in today, use the below syntax. Here, we are expecting that your datetime field is a string type −select yourColumnName1, yourColumnName2, yourColumnName3, ...N from youTableName WHERE STR_TO_DATE(yourColumnName1, ‘format’') =CURDATE();Let’s say we have the following “DateEqualToday “ table that stores users first and last name with ... Read More

Chandu yadav
161 Views
The method java.util.ArrayList.removeAll() removes all the the elements from the ArrayList that are available in another collection. This method has a single parameter i.e. the Collection whose elements are to be removed from the ArrayList.A program that demonstrates this is given as followsExample Live Demoimport java.util.ArrayList; import java.util.List; public class Demo ... Read More

Chandu yadav
660 Views
You need to use backticks around table name as well as database name. The syntax is as follows:UPDATE `yourDatabaseName`.`yourTableName` SET yourColumnName1=yourColumnName1+1 WHERE yourColumnName2=’yourValue’;To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> use test; Database changed mysql> create table Add1Demo ... Read More

Chandu yadav
1K+ Views
You can use prepare statement to Reset MySQL AutoIncrement using a MAX value from another table.The following is the syntax −set @anyVariableName1=(select MAX(yourColumnName) from yourTableName1); SET @anyVariableName2 = CONCAT('ALTER TABLE yourTableName2 AUTO_INCREMENT=', @anyVariableName1); PREPARE yourStatementName FROM @anyVariableName2; execute yourStatementName;The above syntax will reset MySQL auto_increment using a maximum value from ... Read More

Chandu yadav
3K+ Views
Yes, you can achieve this in the following two ways.First Approach At the time of creation of a table.Second Approach At the time of writing query.The syntax is as follows.CREATE TABLE yourTableName ( yourDateTimeColumnName datetime default current_timestamp );You can use alter command.The syntax is as follows.ALTER TABLE yourTableName ADD yourColumnName ... Read More

Chandu yadav
9K+ Views
To delete last record (on condition) from a table, you need to use ORDER BY DESC with LIMIT 1. The syntax is as follows:DELETE FROM yourTableName WHERE yourColumnName1=yourValue ORDER BY yourColumnName2 DESC LIMIT 1;The above syntax will delete last record (on condition) from a table. It sorts the column in descending ... Read More

Chandu yadav
4K+ Views
You can increment a database using update command. The syntax is as follows −UPDATE yourTableName set yourColumnName=yourColumnName+1 where condition;To understand the above syntax, let us first create a table. The query to create a table is as follows −mysql> create table IncrementBy1 -> ( -> Id int, ... Read More

Chandu yadav
1K+ Views
To change MySQL default character set to UTF-8 in my.cnf, firstly reach the location of my.cnf file.The following is the screenshot of “my.cnf” file. Firstly, open the C: directory and the “Program Data” folder −Now, click on “MySQL” folder −Now, click the MySQL Server 8.0 folder and open it −After ... Read More

Chandu yadav
2K+ Views
You can get the last entry in a MySQL table using ORDER BY. The first approach is as follows:Case 1: Using DESC LIMITSELECT * FROM yourTableName ORDER BY yourColumnName DESC LIMIT 1;The second approach is as follows:Case 2: Using MAX()SET @anyVariableName = (SELECT MAX(yourColumnName) FROM yourTableName); SELECT *FROM yourtableName WHERE ... Read More

Chandu yadav
615 Views
The MySQL BOOLEAN and BOOL both are equivalent to TINYINT(1). Whenever you create a column using BOOLEAN and BOOL data type, MySQL implicitly convert the BOOLEAN and BOOL to TINYINT(1). The BOOLEAN and BOOL are equivalents of TINYINT(1), since they are synonyms.Create a table using BOOLEAN data type. The query ... Read More